I haven't read the comics so to me the Chaotix are a detective agency who don't actually detect (except for Sonic Heroes but that doesn't count).

It seemed they were doing SOME detecting in Shadow the Hedgehog, too, though it was never made quite clear what they were trying to take data from Eggman's and the ARK's computers.

I can also see the Chaotix in one of those kinds of investigative adventure games, though.

What I could also see would be a game starring Rouge along the lines of "Metal Gear light edition," so to say. Like, sneaking around and all that but without 2 hours worth of opening cutscenes, much as I personally like Sonic cutscenes. :B

This is easy. A true Sonic SHUMP. You would take control of Sonic and Tails via the Tornado. The game would be in the likes of ThunderForce 4 but with 2D and 3D segments. The 3D segments would be like the Sky Chase mini-game from SA1 but better. You would also be able to upgrade the Tornado and as an unlockable bonus you can play as Dr. Robotnik in his Death Egg suit. The levels could even be from the Classic games or something totally new. Hell, I'd by it!

EDIT: Very rough sketch I did during lunch break to visually show what I mean:

This has serious potential to become a multiplayer mode for Sonic games in the future.

It's not that far of a stretch:
1.) At least six original looping tracks to race on.
2.) Expand that players to allow at least 2-4 people simultaneously. Hell, they could just be those Sonic recolor robots from Colors if you guys start fighting about why Amy could boost or something.
3.) Have that orb be a selectable power in a menu before the race starts, or if non-Sonic robots are used, have the powers character specific, Smash Ball style.

I don't know Sonic Team discontinued the idea of chao gardens, especially since it added replay value via rpg elements, HUB world, getting rings, and small competitions, but I've always felt that was a good thing to expand.

A few years back, I thought of a game where Knuckles built traps, mines, and switches all over Angel Island while Sonic raced through them.

A few years back, I thought of a game where Knuckles built traps, mines, and switches all over Angel Island while Sonic raced through them.

I think I'd love to play a hack like this. e.g. you have to slow him down a certain minimal amount (in order for Robotnik to have his chance, or whatever) to proceed.

In the same vein, MarkeyJester recently showed a screenshot of Robotnik with a net, going after a rabbit. Things like this - role reversals, changes in gameplay that could make the same levels seem totally new, etc. - should be tried out more often. Hint hint!

I would love any spin-off game featuring one of the series' huge cast of characters. Plenty of them would work great in other genres. It'd be wonderful to see more games along the lines of Tails Adventure and Tails' Sky Patrol.

I mean hey, if Luigi's Mansion, Wario Land, Wario Ware, Super Princess Peach, and Yoshi's Island can exist, why can't we get a Big the Cat fishing game? Or a Robotnik RTS? Or a Chaotix point-and-click adventure?

This pretty much is based if Sega ever would go back to Adventure/Heroes styled 3D gameplay. Only better. Sexier.

So this is kinda seen in Sonic 2006 and Sonic Heroes. Basically seeing as I do like a good co-op, I would love to see a 4 player online thing where you would pick from a selection of Sonic's friends and maybe Sonic himself. You would go around large areas, some times you would need to be in a Heroes formation to progress, you'd come across an area where it would be a bit like a Gears of War Horde thing and you would need to get someone playing as a wall climber or a flyer to find a series of switches or some other different puzzle to complete before someone dies. You'd progress through, gets harder, there would be a bit of competition in terms of scoring and rings.

Another one for a Knuckles 3D platformer. Doesn't need to be treasure hunting. I'd love to see it more open world, like an Assassin's Creed/Arkham City. You have your play area, now climb and glide it. I remember seeing my mate play Prototype and he did a bit of gliding. Nearly fell in love with it.

A few years back, I thought of a game where Knuckles built traps, mines, and switches all over Angel Island while Sonic raced through them.

I think I'd love to play a hack like this. e.g. you have to slow him down a certain minimal amount (in order for Robotnik to have his chance, or whatever) to proceed.

In the same vein, MarkeyJester recently showed a screenshot of Robotnik with a net, going after a rabbit. Things like this - role reversals, changes in gameplay that could make the same levels seem totally new, etc. - should be tried out more often. Hint hint!

Not sure who you're hinting to.

Yeah, but in theory, it's hard. You'd have to implement a really smart Sonic AI to go through your stage or an online community who'd hate the game purely because dick moves to slow Sonic down is well, dickish.

You could put pressure on the creator by making it more of a chase, making dick moves harder to pull off and more rewarding. Sonic is chasing Eggman. Eggman is chasing Chaos Emeralds and running away from Sonic. We give Eggman a robotcizing ray gun, the ability to seriously shape and make landscapes in seconds, and allow Eggman to give himself (as well as Sonic) a boost with rockets, springs, and dash panels. The placement of obstacles sacrifice time and distance, but good placement will stop Sonic in his tracks.